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| Solidification of evaporated mother liquor of domestic landfill leachate |
Quan-xiang FENG1,2,3( ),Yi-min FANG4,Qin LI5,Run-qin HAO6,Fa-guang LENG1,2,3,Xiao-xuan DENG1,2,3,*() |
1. China Academy of Building Research Co. Ltd, Beijing 100013, China
2. State Key Laboratory of Building Safety and Environment, Beijing 100013, China
3. National Engineering Research Center of Building Technology, Beijing 100013, China
4. Xiamen Jiarong Technology Co. Ltd, Xiamen 361112, China
5. Tianjin High Energy Time Water Treatment Technology Co. Ltd, Tianjin 300041, China
6. Institute of Resources and Environment, Beijing Academy of Science and Technology, Beijing 100089, China |
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Abstract Cement, cement+lime and self-made hydraulic binder were used to solidify the evaporated mother liquor of a project respectively, in order to solve the problem of lack of suitable cementing materials for solidification when disposing the evaporated mother liquor of domestic landfill leachate. Results showed that after the evaporated mother liquor was solidified, the indicators such as chemical oxygen demand, mass concentration of ammonia nitrogen, mass concentration of grease and conductivity decreased significantly, and the mass concentrated limit of heavy metal ions also met the landfill requirements of domestic waste landfill. However, the evaporated mother liquor was solidified with cement and cement+lime, leading to a long setting time and low strength, which couldnot meet the requirement of transporting slurry to landfill in time. And after the self-made hydraulic binder was used, the slurry process and strength index were significantly improved, meeting the requirements of rapid transition. Comprehensive analysis shows that the self-made hydraulic binder effectively eliminates the absorption of Ca2+ by the evaporated mother liquor under the synergistic effect of calcium bentonite and additives, ensuring that sufficient ettringite and calcium silicate hydrate are generated in the curing system and can exist stably, thus ensuring the rapid setting and strength stability of the solidified evaporated mother liquor.
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Received: 14 November 2022
Published: 11 December 2023
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| Fund: 中国建筑科学研究院有限公司青年科研基金资助项目（20210122331030035） |
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Corresponding Authors:
Xiao-xuan DENG
E-mail: 1401782440@qq.com;732068011@qq.com
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生活垃圾渗滤液蒸发母液固化
为了解决处置生活垃圾渗滤液蒸发母液时缺少适合的固化用胶凝材料的问题，以水泥、水泥+石灰和自配固化剂分别对某项目蒸发母液进行固化试验. 结果表明，蒸发母液固化后化学需氧量、氨氮质量浓度、油脂质量浓度和电导率等指标下降显著，重金属离子质量浓度限值也满足生活垃圾填埋场填埋要求. 水泥和水泥+石灰固化蒸发母液凝结时间长，强度低，无法满足浆体及时转场填埋的要求，而在采用自配固化剂后，浆体工艺和强度指标提升明显，符合快速转场的要求. 综合分析可知，固化剂在钙基膨润土和添加剂的协同作用下有效消除了蒸发母液对Ca2+的吸附，确保固化体系中生成了足量的钙矾石和水化硅酸钙并且都能稳定存在，保证了固化蒸发母液的快速凝结和强度稳定.
关键词：
生活垃圾渗滤液,
蒸发母液,
吸附,
抗压强度,
固化
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